The electrohydrodynamic plumes evolution in viscoelastic fluids with energy transfer process

Two-dimensional direct numerical simulation was carried out to investigate the various dynamic characteristics of electrohydrodynamic plumes in viscoelastic fluids in a complex blade-plate configuration. Here, the effects of different elasticities (Weissenberg number, Wi) and the maximum possible ex...

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Bibliographic Details
Published in:Physics of fluids (1994) 2022-10, Vol.34 (10)
Main Authors: Zhang, Zi-Yao, Chen, Di-Lin, Jiang, Hao-Kui, Su, Zheng-Gang, Luo, Kang, Yi, Hong-Liang
Format: Article
Language:English
Subjects:
Charge density
Direct numerical simulation
Dynamic characteristics
Elasticity
Electrohydrodynamics
Energy transfer
Normal stress
Plumes
Viscoelastic fluids
Viscoelasticity
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Summary:Two-dimensional direct numerical simulation was carried out to investigate the various dynamic characteristics of electrohydrodynamic plumes in viscoelastic fluids in a complex blade-plate configuration. Here, the effects of different elasticities (Weissenberg number, Wi) and the maximum possible extension lengths (L) of polymer are studied. The results show that a new stem expansion process is found for viscoelastic plumes, which is explained by the transport mechanism of free charges. The rise and spread of plumes are promoted with an increase in elasticity and L, which we interpret from both an energy perspective and through the concept of the first principal normal stress difference (Np) for the first time. Our results suggest that when elasticity is weak, the total currents in the system are slightly enhanced due to the denser charge density, and above a certain value of Wi they are considerably inhibited maximum by 11.8% with the increasing of Wi or L mainly because of the variation in Uy.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0113542